1.4.10
发布时间:2020-12-14 04:48:47 所属栏目:大数据 来源:网络整理
导读:question: Modify binary search so that it always returns the element with the smallest index that mathes the search element (and still guarantees logarithmic running time). answer: //注意二分查找一定要是有序数组!!!(我搞忘记了,然后怎么
question:
answer: //注意二分查找一定要是有序数组!!!(我搞忘记了,然后怎么都查不出错QAQ) import edu.princeton.cs.algs4.*; public class BinarySearch { public static int Rank(int key,int[]a,int lo,int hi) { if(lo > hi) return -1; int mid = lo + (hi - lo)/2; if(a[mid] == key) { int min = Rank(key,a,lo,mid-1); if(min != -1) return min; return mid; } else if(a[mid] > key) return Rank(key,mid-1); else return Rank(key,mid+1,hi); } public static void main(String[] args) { int a[] = {0,1,2,4,5,6,8,9,10};//二分查找必须是有序数组!!! int key = 1; int ans = Rank(key,a.length-1); StdOut.println(ans); } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |